Arrangement of Elements (Cambridge O Level Chemistry)

The early Periodic table was used to classify the known elements and was used to predict the properties of the elements that had not yet been discovered.

Which row correctly describes how this was possible?

Potassium and krypton are elements in Period 4. Potassium is at the beginning of the period and is more metallic than krypton which is at the end of the period.

What makes potassium more metallic than krypton?

The elements of the Periodic table can be broadly classified into two main characters which are metals and nonmetals. Which statements are correct?

1. Magnesium is more metallic than silicon.
2. Boron is more metallic than lithium.
3. Carbon is less metallic than beryllium.
4. Sodium is less metallic than aluminium.

The metallic character of the elements changes as you move across a period.

Which statement explains this trend?

An element has an electronic configuration of 2,8,6.

Which group and period can the element be found in?

Element X forms an oxide of formula X₂O₅.

In which group of the Periodic Table is X likely to be found?

Potassium has a lower relative atomic mass than argon but on the Periodic table potassium appears after argon.

Why is potassium placed after argon?

Oxygen, sulfur, selenium and tellurium are Group VI elements. What do all these elements have in common?

Elements W, X, Y and Z are shown.

Which of the following statements are correct?

As you move down a group on the Periodic table the elements become more metallic in character.

Which statement explains this observation?

X and Y are two elements from the same period in The Periodic Table 

The table gives some properties of X and Y 

Which statements are correct about X and Y?

1   Y has a higher melting point than X

2   Y forms negative ions when it reacts 

3   X forms covalent compounds 

4   X forms a basic oxide